When trying to use a small pump to deliver lubrication to bearings of a motor for a set period of time, a _____ may be used?

• A. Timing relay
• B. Pushbutton
• C. Pressure switch
• D. Solenoid

Answer: (A)

Timing control for a device that must run for a fixed interval is exactly what a timing relay provides. When the lubrication pump needs to operate for a specific duration, a timing relay can be triggered and will keep the pump energized for the preset time, then automatically cut power. This ensures the bearings receive the right amount of lubricant without overdoing it.

A pushbutton would require manual action to start, and it won’t stop on its own after a set time unless another timer logic is added. A pressure switch reacts to changes in pressure, not to a timed interval, so it isn’t suited to govern duration. A solenoid acts as an actuator to move a valve or switch, but by itself it doesn’t establish a timed run; you’d still need timing logic to control the duration.